Experimental study on resistivity and electromagnetic radiation of coal under uniaxial compression

Penghong Fan ； Baisheng Nie

《淡江理工學刊》 25卷6期 (2022/12) Pp. 1091-1096

https://doi.org/10.6180/jase.202212_25(6).0004

摘要

In order to study the response of resistivity and electromagnetic radiation at different stages of deformation and failure of loaded coal, the real-time measurement system of acoustic emission, electrical parameters and electromagnetic radiation of loaded coal was established, the variation characteristics of resistivity and electromagnetic radiation pulse were tested respectively in the vertical bedding direction of different coal under uniaxial loading, and the variation regularity was discussed. The research results indicate that in the initial compaction stage, the electromagnetic radiation pulse increases and the resistivity fluctuates to a certain extent with the closure of coal pores and fissures. In the elastic stage, the EME (Electromagnetic Effects) pulses and change of resistivity decrease greatly and the change curve of resistivity is close to be linear. In the unstable development stage, the EME pulses show the peak value, the resistivity fluctuates obviously and tends to decrease further before the stress peak. Through the comparative analysis of resistivity and electromagnetic radiation pulse, the increasing area of electromagnetic radiation pulse generally appears in the area with the large changes of resistivity.

關鍵字

resistivity ； electromagnetic radiation ； uniaxial compression ； coal